Door of a fireplace



FIG. 1 is a top and front perspective view of a door of a fireplace showing my new design;

FIG. 2 is a bottom and rear perspective view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side elevation view thereof, the right side being a mirror image of that shown; and,

FIG. 5 is a front view thereof. 

The ornamental design for a door of a fireplace, as shown and described. 